According to the Unofficial Guide a water view may be a view of a canal, pool, or lake, but may also be a view of a fountain or even a birdbath. They also say a water view may be a view where you have to go out onto a balcony, lean way to the left, and then catch a glimpse of something with water in it in the distance. What they say is 'by God, if you are paying for a water view, you will see some water somewhere, even if it's a birdbath'. One tip they have is to request pool view instead of water view.